<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CORS 跨域</title>
</head>

<body>
  <script>
    let xhr = new XMLHttpRequest();
    document.cookie = 'name=Horace';
    xhr.withCredentials = true; //前端设置是否带 cookie
    xhr.open('PUT', 'http://localhost:4000/getData', true);
    xhr.setRequestHeader('name', 'Horace');
    xhr.onreadystatechange = function () {
      if (xhr.readyState === 4) {
        if (xhr.status >= 200 && xhr.status < 300 || xhr.status === 304) {
          console.log(JSON.parse(xhr.response));
          console.log(xhr.getResponseHeader('name'))
        }
      }
    }
    xhr.send();
  </script>
</body>

</html>